The Detroit Post
Tuesday, 19 October, 2021

How Much To Fix Rust Under Car

author
Paul Gonzalez
• Tuesday, 24 November, 2020
• 7 min read

If rust gets into a vehicle’s frame or body structure, it can become a safety issue for drivers. In fact, if a vehicle’s structure gets rusty enough, there could be a catastrophic failure even in routine daily driving.

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Contents

First, moisture and carbon dioxide in the air mix to create a weak acid that starts to dissolve the iron. Think about how easy it is to crumble a flake of rust between your fingers, and then imagine that stuff trying to protect you and your loved ones during a car crash.

A stray piece of gravel or a minor fender bender is all it takes to chip a car ’s paint, and any iron in the body panels will start to rust as soon as air and water reach the metal beneath it. That means rust spots can be fairly common on used vehicles, particularly if they’ve been driven in a northern U.S. state that uses chemicals and salt to device winter roads.

But if the rusting process goes on too long, it can eat right through the metal, causing holes and allowing body panels to fall to pieces. This is where problems go from cosmetic to dangerous, because modern cars and SUVs rely on these body panels for their structural integrity.

The most serious problems occur when rust gets beneath the car ’s surface and within its underlying components. Rust -free body panels boost a vehicle’s structural integrity, but the parts doing the heavy lifting lie under the car ’s skin.

Unfortunately, this area of a vehicle is often susceptible to rust -causing chemicals and water, which can accumulate there when a car drives down wet or icy roads. Rust only needs a tiny crack in a car ’s structure (or truck frame) to do its work.

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CARFAX also recommends getting an expert inspection that includes putting the vehicle up on a lift, to give your mechanic a better view of under body components. You can apply touch-up paint to stone chips, small scratches, and other minor nicks and dings, but truly repairing rust can take several steps, a variety of tools and materials, and quite a bit of skill.

Depending on the size and severity of the rust, blending the repaired area with the surrounding paint may require wet sanding or buffing the surface. Dirt can retain and trap moisture, and road salt, bird droppings, and other corrosive materials will eat away at paint if they’re left unattended on metal surfaces for long periods.

Waxing it on a regular basis (twice or more each year) will add a protective surface to the paint and clear coat. Wash and wax more frequently if you live near an ocean or in an area where highway crews spread salt on the roads to melt snow and ice during the winter.

Also, frequently check the fender liners and other areas under the hood, along the sides of the engine bay, for any standing water. Check the trunk or cargo area to make sure water isn’t seeping past the seals.

Stone chips and other nicks and dings that are left unrepaired can develop into rust spots over time, so it pays to buy some matching touch-paint to cover those imperfections. If it gets bad enough you will need to do something about it and that means you need to know what the rust repair cost is going to set you back.

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(Source: www.2carpros.com)

Auto Repairs Are EXPENSIVE Engine Replacement: $1300+ Transmission: $1000+ Air Conditioner: $750+ Rust is caused when the metal that contains iron in your car is exposed to moisture and begins to oxidize.

Salt also increases the chemical reaction that leads to oxidation so if you live in a part of the world where roads are salted during the winter months then the metal in your car is at greater risk of faster and more extensive rusting. Because keeping your car away from moisture is literally impossible, rust is often an unavoidable concern for drivers to have to deal with.

The thing about rust repairs is that they can be unpredictable, and they are hard to categorize in terms of cost. Your car could have one rust spot at the edge of a side panel or the entire frame could be corroding.

Small spots of only a few inches in diameter can be repaired on your own if you feel comfortable doing the work. You can buy a Bond repair kit at Autosome for only $20 that will allow you to patch a small rust hole.

You’ll notice rust forms in flaky layers sometimes, almost like a pastry. Likewise, if you have spots or holes caused by rust that span an area or are in a large grouping you’ll need a more in-depth solution.

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(Source: www.whichcar.com.au)

A Bond kit can work here but the more rust you have, the less sound your frame is going to be and also the uglier it’s going to look if you patch it extensively. These larger spots increase the cost proportional to the size or number that you’re experiencing, so while a $20 kit may have fixed a small one, you may be looking at $60 or so for these larger patches, plus labor costs if you go to a mechanic.

Major rust repair costs are going to be very high relative to those small ones you can fix yourself. If your car is rusted so extensively that it’s not cost-effective to even try to repair it, there’s always a chance you can salvage some value by selling it as a junker.

You’ll want to sand a slightly larger area than the rust spot and using a finer grit to feather the edges. The surface needs to be perfectly clean to apply the prep solvent before the paint.

Sand the epoxy primer with 1,000 grit sandpaper then wash with water and dry. Pain with lacquer filler primer, at least two or three coats allowing the recommended drying time between each.

Sand the primer with a 300 to 320-grit sandpaper to get rid of any dried and uneven drips. Spray the base coat of color slowly from left to right in even layers.

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This may be the hardest part because the clear coat is very thin and will run if you over spray. This removes a lot of the guesswork and should help your confidence if you’re new to this kind of work.

If any steps go wrong, especially that clear coat, this process can take up to three days to complete. This is the best way to save time and money on rust -related repairs down the road.

Rust proofing is usually sprayed under the car to protect the bottom, which would naturally have the most exposure to water and salt as you drive. If you’ve ever looked at the underside of a car, you’ll notice the steel components are painted black.

3M, for instance, makes a rubberized undercoat derived from asphalt that not only seals and rust -proofs the car, it also helps deaden road noise. A second aspect of the permanent rust proofing that many cars will receive is a paraffin-based sealant such as Guard.

It’s meant to not drip off the car to leave any streaks on your driveway, and it should be applied once a year. Get your car waxed before winter arrives as an extra layer of protection.

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(Source: www.therandomautomotive.com)

The cost of repairing rust damage can get fairly extensive if it’s been allowed to go for a considerable period of time, but with a little maintenance, it doesn't need to be so extreme. Rust, which is a kind of deterioration in which oxygen gets into metal, eventually making it to turn into a reddish-brown color, will ultimately consume parts of your vehicle if you overlook it.

Significant repair work, typically bigger than 12 inches in size, can be very deep and even go through the metal, leaving hollow areas. An online forum member on GarageJournal noted that they took their vehicle to a regional store and were quoted around $300 to sand down the whole hood and repaint it.

The rust area, when left unattended, can grow as time goes on, continuing to spread out till it’s effectively stopped. For rust jobs that have been disregarded for rather a long time, the parts damaged will be examined to identify the very best strategy.

If you’re trying to find an efficient long-lasting repair work, then it’s typically smart to change the whole panel for structural and stability reasons. Plus, changing the panel can frequently avoid the rust from persisting as most repair work will not last a lifetime, particularly if you continue to use the car in the exact same way you had before.

You can also eliminate rust with a sanding disk on an angle mill, followed by the addition of a body filler, such as Bond. Prevention is essential, and despite the fact that it might be too late, it’s constantly a good idea to park your vehicle inside as much as possible to protect it from the outdoors.

curb hit camber wheel opposite wtf reply
(Source: maxima.org)

Robert Robert2111 gold badge11 silver badge33 bronze badges By the time the inspection was completed (and failed), I had a hole in my muffler system along with about $2,500 worth of rust related repairs for a $1000 vehicle.

However, to check you're going to have to do the squeeze test between fingers and thumb on the thicker structural sections, then if you still can't determine how severe or not the rust is. It's time to get an old screwdriver out and tap (with the handle part) on the rustiest bits. If the material is corroded right through holes will likely appear, this is not good especially in the structural sections, if this is the case then you may like to walk away from this one as welding will be required.

If however it is just surface rust then a scrap off and clean up followed by an application of under body protection will suffice and your good to go. The seller should have no issues at all with you taping on the structural parts of the body to check its integrity.

In some parts of the world where lots of salt is used in the winter, this is not unusual rust. If you want to keep it longer term, I'd treat the rusty areas on the under body with a wire wheel brush on an angle grinder, rust converter and fresh undercoating after a thorough clean.

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